Source note · Early media and ringback behavior
RFC 3262 allows session descriptions to be exchanged in reliable provisional responses and in PRACK, so the session can be established before the call completes.
Checked 2026-09-24
- Vendor
- IETF
- Product
- SIP
- Subsystem
- offer/answer
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 3262
- Checked
- 2026-09-24
Sources
- RFC 3262: Reliability of Provisional Responses in the Session Initiation Protocol (SIP) — IETF / RFC Editor · tier 1 standards and regulators · Section 5 (Provisional Responses and Offer/Answer)
Cite this note
APA
WarmTransfer. (2026, September 24). Early media and ringback behavior: source note early-media-ringback-sdp-in-reliable-1xx. WarmTransfer. https://warmtransfer.net/knowledge/claims/early-media-ringback-sdp-in-reliable-1xx
BibTeX
@misc{warmtransfer-claim-early-media-ringback-sdp-in-reliable-1xx,
title = {Early media and ringback behavior: source note early-media-ringback-sdp-in-reliable-1xx},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/early-media-ringback-sdp-in-reliable-1xx},
note = {Source note early-media-ringback-sdp-in-reliable-1xx, checked 2026-09-24}
}